Valve assembly



Aug 25, 1936. o. F. CARLSQN 2,051,938

VALVE ASSEMBLY Filed June 29, 1955 2 Sheets-Sheet 1 Aug; 25, 1936. o. F.CARLSON VALVE AS S EMBLY Filed June 29, 1935 2 Sheets-Sheet 2 PatentedAug. 25, 1936 vALvr: ASSEMBLY Oscar F. Carlson, Chicago. Ill., assignerto Oscar F. Carlson Company, Chicago, Ill., a corporation of IllinoisApplication June 29,

18 Claims.

This invention relates'to valve assemblies, and is directed moreparticularly to a valve assembly for a feed water control to a boiler orthe like, whereby the amount of water fed to the boiler may beautomatically controlled in accordance with the position of a remotelydisposed iloat mechanism, or may be manually controlled, if desired. Itis obvious, however, that the particular valve mechanism shown herein isnot limited only to this specic use.

In the preferred embodiment of my invention, I provide a valve assemblyin which the valve member is mounted for longitudinal reciprocatorymovement in response to actuation of a suitable solenoid mechanism, theconstruction being such that the valve member is positively held uponits seat independently of gravity or water pressure when the solenoid isin inoperative position.

Another feature of the present invention resides in the provision of adash pot arrangement for Vthe valve member, whereby it cannot be snappedinto full open position or into closed position. This is of distinctadvantage in eliminating water hammer due to suddden closing of thevalve, thereby preventing pounding in the water lines, which isdecidedly objectionable.

The present construction also provides an arrangement wherein the valvemember is maintained in substantially balanced position with respect towater pressure whenever the valve is opened. whereby variations in waterpressure will not aiect the operation of the valve under the influenceof the controlling mechanism.

It is also within the contemplation of the present invention to providea valve assembly responsive to actuation of a remotely disposed waterlevel control device or the like, whereby the valve is automaticallyopened upon closing of the circuit in the control device due to loweringof the water level in a boiler or the like, and is automatically closedupon raising of this water level to a predetermined maximum. Provisionis also made for manual operation of the valve through the sameoperating mechanism, when and if desired, thereby eliminating the usualby-passes and auxiliary piping formerly required.

Another distinct feature of the present invention resides in theprovision of a lost motion connection between the electricallycontrolled magnetically responsive actuating member and the valveoperating means, whereby the inertia of movement of this member isemployed to force the valve open from what may be termed an unbalancedposition whereby the pressure in the valve chamber tends to maintain itclosed, and to 1935, Serial N0. 29,001

force the valve into this position upon deenergization of the actuatingcircuit.

Still another feature present in my construction is the separation ofthe valve stem and the actuating means, the two parts being connected bya link arrangement and so arranged that a straight line opening andclosing force -is imparted to the valve stem axially thereof, whereby nobinding of the stern in its guides is produced.

Another advantage secured by the present invention is the provision ofan operating chamber for the valve actuating mechanism in whichpractically no interchange of water takes place, so that the water inthis chamber remains substantially the same at all times. This reducesto a minimum the depositing of foreign materials carried by the water inthis chamber, whereby the opening of the valve assembly for cleaningthis chamber is eliminated, and further, there is no interference withfree reciprocation of the valve stem by the depositing of grittyparticles or the like upon the valve bearing portion.

In addition, I provide a ilexible metallic seal for carrying the valveoperating mechanism outwardly of the valve housing to the manual andelectrical control mechanism, thereby sealing the chamber againstleakage of water, and at the same time providing for free operation ofthe actuating mechanism through the sealed opening.

Other objects and advantages of the present invention will appear morefully from the following detailed description. which. taken inconjunction with the accompanying drawings, will disclose to thoseskilled in the art the construction and operation of a preferred form ofthe present invention.

In the drawings:

Figure 1 is a vertical sectional view through the valve assembly andoperating mechanism;

Figure 2 is an end sectional view of the oper- 40 ating mechanism shownin Figure 1, taken substantially on the line 2 2 of Figure 1; and

Figure 3 is a top plan view of the mechanism 'shown in Figure l.

Referring now in detail to the drawings. I provide a valve housing orcasing 5, having an inlet opening 6 and an outlet opening 1. The casingis also provided with an intermediate wall 8. which provides anauxiliary chamber 9 carrying the valve actuating mechanism.

'Ihe inlet chamber is connected through opening 6 to a suitable supplysource for feed water or make-up water, the flow of the water beingcontrolled by the valve stem l0 cooperating with the valve seat I2formed by the hollow bushing 55 2 member I3carried in a partition wallI4 formed in the casing 5 between the inlet 6 and outlet 1.

The water entering the inlet 6 passes through a suitable cylindricalscreen or iilter I5 disposed anterior to the valve opening I1 formed inthe bushing I3, and ls supported in position by means of a plate memberI6 secured against the lower portion of the valve casing about theopening I9 therein, there 'being a suitable gasket 26 interposedtherebetween. Suitable'- bolts 22 provide for clamping of the plate I8to the valve casing 5, and a suitable drain-out or clean-out plug 23threads into the plate I8 for the purpose of accommodating cleaning outof the interior of the lter I5 whenever it becomes filled with foreignmaterial deposited therein by the flow A of water therethrough. Thelower end of the lter I5 is supported in an annular cup-shapedsupporting ring 24 mounted upon a suitable recessed shoulder formed inthe inner face of the closure plate I8. v

In order to provide access to the valve seat I2, a closure plug 25 isthreaded into the lower wall of the casing 5 directly below the bushingI3, whereby the bushing I3 may be secured in position' through thisopening, and the plug 25 then screwed into position to close the same.

Mounted upon the valve casing 5 and closing the auxiliary chamber 9 is asecond housing member 26, which is secured by means of suitable bolts 21to the top of the valve casing 5, there being a suitable gasket 28clamped between the two housings.

The housing 26 is provided with a boss'portion 29 which is suitablybored at its lower inwardly extending end to receive the upper end ofthe valve stem member I0, there being a suitable closure plug 39 mountedin the upper endv of this opening and forming a dash-pot chamber 32 forcushioning the opening and closing movement of the valve stem I0.

The stem I0 is guided for movement in the opening 32, and in a suitableopening formed in the intermediate partition wall 8. The lower end ofthe valve stem I0 is frusta-conical in shape, as indicated at 33, and isadapted to have bearing on the valve seat I2 for closing ol the now ofwater from the inlet 6 tothe outlet 1. With the particular type of valvedisclosed, I iind that an opening of approximately 11g of an inch issuiicient to provide for the desired flow of water through the valveassembly.

Intermediate its ends, the valve stem I6 is provided withl an openingreceiving the pin member 35, to which is secured a U-shaped actuatinglink 36, the lower end of thc link 36 being secured by the pivot 31passing through the enlarged opening 38` in the valve stem I8 andsecured to the ends of a pair of arm members 38 riveted together at 39and 40. The two link members are spread outwardly adjacent the valvestem, to pass on. opposite sides thereof, and are secured tothe link 36whereby the linkpivots'about the ends of the arm 38', and a straightline thrust against the pin 35 is thereby produced for opening andclosing the valve member.

An operating arm member 42 is flxedly secured to the arm 38 by means ofthe pin. or rivet 40, and is pivoted at 43r to a pair of ears 44 carriedby the upper casing or housing section 26. The pivot 43 forms thepivotalrsupport for the arm comprising the arms 38 and crank arm 42. Theconnection between the arms 38 and the casing 2 is in the form of abellows seal 45 which is secured at its lower end to a plate 46 carriedon the struction, the plate 46 is first secured against the lower end ofthe bellows 45, and the arms 38 are then pressed upwardly thereagainst,the pinY 40 then being passed through the lower end of the arm 42 andthe arms 38 to secure the same in tight abutting engagement with theplate 46. The plate 46 is provided with a rectangular opening of sucientsize to accommodate the lower reduced portion 50 of the arm 42, which isthen sealed by soldering.

The arm 42 comprises a pair of plate members 52 and 53, which areriveted together at a plurality of points such as indicated at 54, tohold the same in tight rigid engagement, and are spread apart betweenthe ears 44 to provide suitable bearings for the arm about the pivot 43.

At their upper ends, the plates 52 and 53 forming the-arm 42 include acam portion or slot 55, in which a roller 56 is disposed. The roller 56is carried on a pin 51 disposed between a pair of downwardly extendingarms 58 formed at the inner end of a hand operated lever member 59. Thislever 59 is pivoted at 60 about a pair of outwardly extending ears 62carried by the solenoid supporting housing 63.

The arms 58 of the lever member 59 are also engaged by a suitable pin 64carried by the lower bifurcated ends 65 of a loose sleeve 66 carrying aplunger member 61 therein, the plunger member 61 being restrainedagainst movement laterally of the sleeve 66 by means of inwardlyextending iianges 68. The plunger member 61 is provided at its upper andlower ends with cushioning members 69, which may be formed of cork,rubber or the like, and which are adapted to abut against the upper end19 of the member 66 and against a cross piece 12 carried at the lowerend of the flanges 68 above the bifurcated arms 65.

The solenoid housing 63 is supported upon the upper casing member 26 bymeans of a plurality of bolts 13 as mpre clearly shown in Figure 3. Theupper end ofthe housing 63 is formed to receive the solenoid coil 14,which is mounted upon a suitable supporting member 15 disposed withinthe open upper end of the housing 63, the coil being connected to a pairof binding posts 16 and 1 1 by means of the conductors 18. These bindingposts are carried in a lateral extension 19 of the housing 63, beingsupported upon suitable supporting bushings which therebetween supportan insulating block 82.

Between the terminals 16 and 11 I provide an insulating barrier web 83formed integral with block 82. A supporting insulating strip 84 coversthe counter-sunk heads of the terminals 16 and 11. From the terminals 16and 11, conductors may be led out of the opening 85 in the extension 19of the housing 63 for connection to any suitable actuating circuit, suchas a remotely disposed iioat responsive mechanism or the like. Closureof this circuit results in energization of the solenoid coii 14 throughthe terminals 16 and 11. A suitable closure plate 86 is mounted upon theupper anged end 81 of the housing 63 by means of a plurality of screwmembers 88, also extending over and closing the upper end of theextension 19 of the housing.

In the operation of the device disclosed, with the valve set in theposition shown in Figure 1, it is closed upon ,its seat due to the factthat the pivot 43 is disposed slightly oil? center with respect to thecenter line of the bellows 45, being placed slightly to the left of theline between the pin 51 and the pin 40. This provides for a greaterpressure being exerted upon the right side of the bellows than isexerted upon the left side of the bellows, it being remembered that thepressure of the water at the inlet 6 causes the auxiliary chamber 9 tobe illled with water which is at substantially inlet' pressure. .Thusthe valve 'IIJ is maintained closed, more or less independently ofgravity acting on the valve itself or the pressure within the inletacting on the lower end of the valve. This offset of the pin 43 resultsin stressing of Ythe bellows in what might be termed a counter-clockwisedirection, so that the bellows tend to rotate the arms 38 in a downwarddirection, tending to force the valve member I upon its seat. However,whenever the arms 38 are swung in a clockwise direction, the plate 46 isshifted slightly to the left so that the pressure within the auxiliaryor intermediate chamber 9 is now substantially equal on both sides ofthe pivot 43. Thus, whenever the valve is opened, the pressure withinthe chamber 9 is substantially balanced so far as any further tendencyto open or close the valve l0 is concerned. During normal operation ofthe valve, therefore, to and from its seat, there is no pressure tendingto urge it in either direction.

Upon actuation of the solenoid coil 64, the plunger member 61, which isdisposed within the guide sleeve 66 extending up into the core 9U of thecoil, is drawn upwardly, and its inertia of movement upon striking theupper end of the sleeve 66 produces an upward impact on the sleeve. Thisstriking-of the plunger against the upper end of the sleeve 66 resultsin moving the sleeve upwardly, which, through its bifurcated end 65connected to the pin 64, results in drawing of the roller 56 upwardlyagainst the camming surface of the slot 55. This rotates the arm 42 in aclockwise direction about the pivot 43, thereby shifting the lower endof the bellows sealing member and the pin 40 slightly to the left,whereby the links 38 are urged upwardly. 'I'his movement of the arms 38upwardly at their left hand end results in the production of an upwardthrust at the pin 35 through the link 36, moving the valve stem upwardlyoi of its seat. Due to the fact that there is some clearance between theupper end of the valve stern I0 and the walls of the cylin- -dricalopening 32, there is water disposed in this opening, and consequently itis necessary that this water be displaced before the valve member I0moves into its full open position. This provides a dash-pot arrangement,therefore, preventing opening of the valve member Ill'with any greatdegree of snap action, and its opening movement is thereby cushioned bythe water within the cylindrical chamber 32.

As long as the solenoid coil 14 remains energized, the plunger member 61and the sleeve 66 will be maintained in upper raised position, holdingthe arm 42 in its pivoted position, and thereby holding the valve stemI0 in its upper or raised position. Upon deenergization of the coil 14,the plunger 61 drops downwardly, hitting the bar 12, and thereby movingthe sleeve member 66 and the roller 56 downwardly so that the rollermoves inwardly of the slot 55, allowing the arm 42 to rotate slightly ina counter-clockwise direction,

whereby the pressure of the water within the auxiliary chamber 3restores the bellows to its normal position, and slightly cocks the samedue to the .fact that the pivot 43 is disposed slightly oil' center withrespect to the center line of the bellows, forcing the varms 38downwardly by moving the pin 40 slightly to the left, and thereby movingthe valve stem I0 downwardly onto its valve seat I 2. However, due tothe fact that there has been a displacement of water in the chamber 32,downward movement of the valve stem l0 outwardly of this chamber willresult in producing a vacuum within the chamber, which retards theclosing movement of the valve stem, and thereby prevents rapid closingof the valve. This eliminates water hammer in the lines connected to thevalve, and thus eliminates the objectionable pounding heretoforeoccasioned by electrically operated valves.

It may be desirable, at times, to operate the valve to allow water toflow independently of the automatic operation provided by the solenoid15. For this purpose, the outer end of the manually operable lever 59 ispressed downwardly, moving the roller 56 upwardly in the slot 55, andthereby moving the roller in an arc about the pivot 60. This cams thearm 42 slightly to the right at its upper end, moving the lower end ofthe arm and the pin 40 to the left. This results in imparting theraising movement of the arms 38 to the valve stem I0 through the link 36and pin 35, and pro-- vides for raising of the valve by manual operationindependently oi the solenoid 14. This operation of the valve in no waydisturbs the solenoid actuating mechanism, and thereby provides foroperation of the valve manually at the valve with the consequentelimination of auxiliary piping and valve means, which was heretoforenecessary. Upon return of the manually operable lever 59 to the positionshown in Figure l, the ilexible bellows returns the arm 42 to its normalposition and since the pivot 43 is disposed slightly to the left withrespect to the center line of the bellows, overstresses the bellows toan extent such that it tends to cock in a direction such that the plate46 moves the pin 40 slightly to the right, and the pressure within thechamber 9 maintains the bellows in a partially unbalanced condition,with the arms 38 being urged in a counter-clockwise direction. 'I'hisholds the valve member I0 firmly upon its seat.

It is therefore believed apparent that I have provided a valve assemblyfor use either with a manually or automatically operable controlmechanism, whereby the valve actuating mechanism will produce openingand closing movement of the valve without any water hammer or the like,and further, will tend to maintain the valve closed independently ofgravity or water pressure by reason of the displacement of the pivotwith respect to the ilexible sealing means. In addition, due to the factthat there is practically no movement of water into and out of thechamber 9 after the chamber has once been filled, there is no chance forany accumulation or depositing of foreign materials, grit, dirt or thelike within this chamber, which would interfere with the operation ofthe valve actuating mechanism or the reciprocatory movement of the valvestem. Another advantage is produced by the limited amount of movement ofthe plunger 61 which can be provided before the plunger operates thesleeve member 66, whereby the impact of its movement upon the upper orlower stops 10 and 12 of the sleeve results in the proper cammingoperation by the roller S in the slot 55 of 'the arm 42 to pass thelower end of the arm, and the pivot 40 past the center line position sothat the valve may be opened. Thus the valve is normally maintained in abiased position tending to hold the same closed, but by the impactmovement of the solenoid actuating member it can be forced over thisposition and then resume its normal movement.

Various other features are apparent' from the detailed description, suchas the facility in assembling and disassembling the valve forinspection, repair or replacement of parts, the provision of a ilexiblesealing member for carrying the valve actuating mechanism out of thevalve housing, the ease of removing the lter means and the valve seatmember for adjustment, cleaning, or repair, and the incorporation of themanually operable member directly within the valve construction, so thatno auxiliary piping or additional valve members need be required.

Having therefore described my invention in accordance with the patentstatutes, what I claim as new and desire to secure by Letters Patent is:

1. In a valve assembly having a reciprocable valve member, actuatingmeans for said member including an arm having means for connecting it atone end to said valve member, a second arm l pivotaliy mountedintermediate its ends and hav- `lng rigid connection at oneend to theopposite end of said ilrst arm, a cam slot in the opposite end of saidsecond arm, cam means engaging in said slot, and a resilient tubularbellows enclosing said second arm between said rigid' connection andsaid slot and sealed to a xed support, the pivotal mounting of saidsecond arm being disposed laterally of the center line of said bellowswhereby pressure exerted through the bellows tends to cock said secondarm in one direction about its pivot.

2. A valve assembly including a valve housing having inlet and outletopenings, valve means for controlling liquid flow between said openingsincluding a reciprocable valve stem guided for movement in said housing,a closure member secured to said housing and having an opening spacedlaterally of said valve stem, pivot ears carried by said member andextending into said housing below said last mentioned opening, an armpivoted intermediate its ends between said ears and extending outwardlythrough said last mentioned opening, means pivotaliy connected betweenthe inner end of said arm and said stem, and resilient bellows enclosingthe ears and sealed to the closure member about said last mentionedopening, said bellows being responsive to pressure in said housing fornormally biasing said valve stem toward valve closed position.

3. In a valve housing having a valve membe actuating means for saidmember including an arm pivoted intermediate its ends, means engagingone end of said arm for rotating said arm in one direction about itspivot, a resilient bellows enclosing a portion of said arm and havingone end fixed in position, the opposite end of said bellows beingrigidly secured-to said arm, means rigidly secured to said arm adjacentsaid opposite end of said bellows, the pivot of said arm being disposedlaterally of the center line of said bellows whereby pressure exertedthrough said bellows tends to rotate said arm in a direction opposite tothat produced by the rotating means, and means pivotally securing saidrigidly secured means to said valve member.

4. In combination, a valve housing, a valve seat therein, a. valve stemguided for reciprocal movement toward and away from said seat, actuatingmeans pivotaliy connected to said stem within said housing and having aportion thereof extending parallel to said stem and outwardly of saidhousing, resilient bellows means enclosing a portion of said extendingportion and sealing the interior of said housing against leakage pastsaid portion, said extending portion being pivotaliy mounted within saidbellows, and external means for rotating said extending portion aboutsaid pivotal mounting.

5. The combination, in a valve assembly having a reciprocatory valve, apivotaliy mounted bell crank lever connected at one en d to said valveand having cam means at the opposite end thereof, pressure responsiveresilient means engaging said lever and normally biasing it toward valveclosed position, and a cam member engageable with said cam means andmovable in a limited arc for actuating said member, of actuating meansfor said cam member including a sleeve member connected thereto andhaving an armature having limited sliding movement therein betweenspaced restraining means on said sleeve member, and electromagneticmeans for actuating said armature into impact against said restrainingmeans to snap said cam member against said cam means for throwing saidlever toward valve open position.

6. In combination, a valve housing, a valve therein, actuating means forsaid valve including a pivoted bell crankl having pivotal connection atthe end of one arm portion with said valve and having a cam slot in theend of the other arm portion externally of said housing, a manuallyoperable lever plvotally supported externally of said housing and havingmeans engageable in said slot for rotating said bell crank, and meanssealing the extending cam portion of said arm and operable throughpressure in said housing for normally biasing said arm toward valveclosed position.

7. A valve assembly including a reciprocatory valve member, a linkengaging said member intermediate its ends land pivotaliy connectedthereto, said link having a web portion engageable with said stem tolimit pivotal movement of said links, an actuating lever having abifurcated end receiving said stem, a pivot between the end of saidlever and said link extending through an enlarged opening in said memberbelow the pivotal connection between said member and said link, andmeans for rocking said lever through a limited arc to reciprocate saidvalve member.

8. A valve assembly comprising a. valve housing, a reciprocatory valvemember therein, means pivotaliy mounted in said housing for actuatingsaid valve member and including an arm extending outwardly of saidhousing, means supported externally of said housing and having cammingengagement with said arm, electromagnetic means supported on saidhousing, means controlled thereby for actuating said camming meansincluding an armature having means for imparting a blow to saidactuating means, and exible sealing means for the extending portion ofsaid arm and through pressure normally biasing said valve actuatingmeans toward valve closed position, said armature blow removing saidbias during valve opening movement.

9. A valvel assembly including a valve housing, valve means forcontrolling liquid flow through said housing, and actuating means forsaid valve means extending into said housing at a point spaced laterallyof said valve means and having pivotal connection therewith, saidactuating means having a fixed pivot Within said housing, and resilientmeans sealing the actuating means from the interior of said housing andnormally through pressure biasing said valve means against openingmovement, the bias of said sealing means being removed uponpredetermined movement of said valve means.

10. In combination, a valve housing having a valve seat therein, a valvemember reciprocable in said housing for engaging said seat, a linkpivoted on said member intermediate the ends thereof, a rocking armpivotally mounted in said housing and having an outwardly extending end,a lever rigidly secured to the inner end of said arm and pivotallyengaging said link whereby rockingA of said arm about its pivot inopposite directions reciprocates said valve member, a cam slot formed inthe outer end of said arm, means engageable in said slot for rockingsaid arm, and iiexible resilient bellows sealed to said housing aboutthe opening through which said arm extends and enclosing the pivotalsupport of said arm, said bellows normally through pressure biasing saidarm in a direction to hold said valve member in closed position.

11. In combination, a valve housing, a valve seat therein, areciprocatory valve member for said seat, an intermediate chamber insaid housing, actuating means in said chamber spaced laterally of saidvalve and including an arm pivotally connected to said member to impartlongitudinal reciprocatory movement thereto, sealing means comprising aiiexible bellows for sealing the outlet from said chamber through whichsaid arm extends, and means supporting said arm and oset with respect tosaid bellows means so that the pressure in said chamber cocks said armin a direction tending to hold said valve member on said seat.

12. In combination, a valve housing having inlet and outlet chambers, anintermediate chamber therebetween communicating only with said inletchamber, a closure for said intermediate chamber having a pair ofinwardly extending ears forming a pivotal support within saidintermediate chamber, an arm pivoted intermediate its ends on saidsupport and having an outwardly extending end, a cam surface formed insaid end, a valve member guided for reciprocatory movement in saidhousing, means pivotally connected to said member and secured to theopposite end of said arm, a manually operable lever pivoted to saidclosure externally of said housing and having camming means engagingsaid cam surface for rocking said arm about said pivotal support toreciprocate said valve member through said pivotally connected means,and flexible sealing means sealing said arm and pivot ears from saidintermediate chamber and offset with respect to said arm whereby thepressure on said sealing means normally -cocks said arm toward valve`closed position.

13. In combination, a valve housing having an inlet chamber, an'outletchamber, a valve seat therebetween, a valve engageable with said seat,an intermediate chamber having an opening forming a guide for said valveand communicating with said inlet chamber, said intermediate chamberhaving a closure member provided with a pair of laterally spacedopenings, one of said openings being closed to provide a dash pot andguide for the upper end of said valve, actuating means for said valvepivotally mounted on said closure member within said intermediatechamber, and iexible sealing means about the other opening in saidclosure member and enclosing the pivotal mounting of said actuatingmeans, said sealing means being oilset with respect to said pivotalmounting whereby pressure thereon normally biases said actuating meanstoward valve closed position.

14. In combination, a valve housing, a reciprocatory valve membertherein, an intermediate chamber having means for guiding reciprocationof said member, a closed chamber at one end of said member forpreventing snap opening or closing of said member, actuating means forsaid member pivoted in said intermediate chamber and extending outwardlyof said housing, and flexible sealing means enclosing Vthe pivotalmounting of said actuating means and normally biased to position to holdsaid Valve member in valve closed position, said bias being removed uponinitial operation of said actuating means in valve-opening direction.

15. In combination, a valve housing, a reciprocatory valve membertherein, actuating means pivoted laterally of said member in saidhousing and pivotally connected with said member, said actuating meanshaving an amr extending outwardly of said housing parallel to saidmember, a flexible bellows rigidly secured to said actuating means andenclosing the pivot thereof for sealing the extending portion of saidarm from said housing, said bellows being eccentrically disposed withrespect to said arm whereby pressure on said bellows nonnally biasessaid arm toward valve closed position, and means disposed externally ofsaid housing and including a cam engaging the end of said arm forrotating said arm to move said valve member toward open position, saidmeans simultaneously moving said bellows over center with respect tosaid arm pivot to remove said bias after predetermined movement of saidvalve member.

16. In combination, a valvehousing, a reciprocatory valve membertherein, actuating means pivoted laterally of said nrember in saidhousing and pivotally connected therewith, said actuating means havingan arm extending outwardly of said housing, a flexible bellows rigidlysecured to said actuating means and enclosing the pivot thereof forsealing the extending portion of said arm from said housing, saidbellows being eccentrically disposed with respect to Said arm wherebypressure on said bellows normally biases said arm toward valve closedposition, and means pivoted externally of said housing and engaging theouter end of said arm for rotating said arm against said bias to opensaid valve, said means simultaneously moving said bellows over centerwith respect to said arm: pivot to remove said bias after predeterminedmovement of said arm.

17. In combination, a valve housing, a reciprocatory valve membertherein, actuating means pivoted laterally of said member in saidhousing and pivotally connected therewith, said actuating means havingan arm extending outwardly of said housing, a iiexible bellows rigidlysecured to said actuating means and enclosing the pivot thereof forsealing the extending portion of said arm from said housing, saidbellows being eccentrically disposed with respect to said arm wherebypressure on said bellows normally biases said arm toward valve closedposition, and means disposed externally of said housing engaging theouter end of said arm for rotating said arm, said means including a'sleevelmemherI an amature having limited free movement therein, andelectromagnetic means for actuating said armature, said armature uponactuation imparting a blow to said sleeve member which moves saidbellows out of said normal biasing position.

18. In combination, a valve housing, a valve seat, a valve membershiftable in said housing toward and away from said seat, a pivot offsetlaterally of said valve member in said housing, actuating means on saidpivot having a normally extending portion pivotally connected to saidmember and having resilient means sealing said pivot and a portion oisaid actuating means from the interior of said housing, said resilientmeans being responsive to pressure in said housing for normally biasingsaid actuating means toward valve closed position, and impact meansoperatively connected to the actuating means externally of said housingand adapted upon energization to remove said bias and to cause saidactuating means to move toward valve open position, said impact meansupon deenergization restoring said bias as said actuating means movesinto valve closed position.

OSCAR F. CARLSON.

